How to find a percent of a number

What number is 7 units left of -15?

Could someone me with this question i’ve been stuck on it for 20 minutes

Describe the end behavior of the function below. f(x)=(2/3)^x-2 a. as x increases, f(x) approaches infinity. b. as x decreases, f(x) approaches 2. c. as x increases, f(x) approaches -2. d. as x decreases, f(x) approaches negative infinity.